Effacement means that the cervix stretches and gets thinner. Dilatation means that the cervix opens. As labor nears, the cervix may start to thin or stretch (efface) and open (dilate). This prepares the cervix for the baby to pass through the birth canal (vagina).

Can you be 100% effaced and not in labor?

This probably isn't the answer you want to hear, but you can be varying degrees of dilated or effaced for several days — or even weeks — before true labor begins. Alternatively, you might not be dilated or effaced at all and still go into labor within hours.

How long after effacement does labor begin?

This process takes about 5 to 7 hours if you're a first-time mom, or between 2 and 4 hours if you've had a baby before. The exact duration of this stage is different for everyone. Once your cervix is 10 cm dilated and 100 percent effaced, you're ready to start pushing.